void main() {
  ///print("你好，dart");
  ///
  // var str = '你好dart';
  // var myNum = 1234;

  // print(str);
  // print(myNum);
  String str = "你好，dart";
  int myNum = 1234;
  final PI = 3.14156;
  const PI2 = 3.1415;

  final a = new DateTime.now();
  //const a = new DateTime.now();
  print(a);

  print(PI);
  print(PI2);
  print(str);
  print(myNum);
}
/* */
//
///